There are other, less technical signs. We're talking about the signs of that make you think twice and wonder if irrational exuberance has taken over and investors are investing in things recklessly.

We've pinpointed the 15 most ridiculous moments in finance of the year so far that might lead one to believe that this bull market has seen its top.

1/

Marketwatch profiles "the Oracle of San Quentin."

REUTERS/Stephen Lam

Since his conviction 15 years ago on murder charges, Curtis Carroll, now 35, has gained a reputation among inmates at the infamous California penitentiary as an investing wizard. Marketwatch's Catey Hill says that while it's impossible to judge his track record, his advice "some quite good, some risky and speculative, and most of it brand-new territory for a clientele that lives behind prison walls."

2/

Burrito Bonds

Chilango

A U.K. Chipotle-esque chain is looking to raise funds from mainstream investors by offering "burrito bonds" that come with an 8% coupon, and of course free burritos for a year.

3/

Uber for Underwear.

OK, technically FlyCleaners.com, backed by Union Square's Fred Wilson, will also deliver the rest of your laundry at a moment's notice. Through your phone you just tell them exactly where you need your clothes picked up, and they come to you.

El Pollo Loco surges on IPO.

The Snapchat valuation story.

Bloomberg reported Alibaba wanted to buy Snapchat for $10 billion. BI's Alyson Shontell then reported this was "highly unlikely." But if it did happen, Snapchat would be the ninth-largest tech firm according to Tara LaChapelle.